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Technical Briefs

Thermal Characterizations of Fin-Thin Film Systems

[+] Author and Article Information
A.-R. A. Khaled

Department of Thermal Engineering and Desalination Technology, King Abdulaziz University, P.O. Box 80204, Jeddah 21589, Saudi Arabiaakhaled@kau.edu.sa

J. Heat Transfer 132(10), 104503 (Jul 28, 2010) (6 pages) doi:10.1115/1.4001647 History: Received February 07, 2010; Revised April 16, 2010; Published July 28, 2010; Online July 28, 2010

This work considers heat transfer in fin-thin film systems. Two types of these systems are analyzed: (A) a thin film sandwiched between two identical fin halves, and (B) a fin sandwiched between two identical thin films. The corresponding coupled energy equations are solved numerically by an implicit, iterative, finite-difference scheme. Comparisons with derived approximate closed-form solutions are performed and good agreement is obtained. A parametric study of all involved parameters is conducted and presented graphically. Useful correlations containing the various physical parameters for both types are reported. It is found that thermal efficiencies of fins can be increased significantly by introducing an internal flow inside the fin material. Moreover, factors producing more internal convections are found to increase the fin-thin film thermal efficiency. In addition, thermal efficiencies of type A systems are found to be higher than those of type B systems. Moreover, the resulting system thermal efficiency is found to have at most one local maximum and one local minimum over the whole relative heights ratio spectrum. Finally, this work paves a way for an effective combined passive and active method for enhancing heat transfer.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic diagram for type A fin-thin film systems and the corresponding coordinates system

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Figure 2

Schematic diagram for type B fin-thin film systems and the corresponding coordinates system

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Figure 3

Effects of Π2 and Π1 on ηA

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Figure 4

Effects of Π2 and Π1 on ηB

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Figure 5

Effects of β and Bi on ηA

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Figure 6

Effects of β and Bi on ηB

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